Depends if you mean just the foam or complete finished cushion ??
I was starting from scratch so i bought foam from GB foam ,you can go on their site and put the relevant dimensions into their pattern (i think i used bull nosed ) select foam type and they will laser cut to perfection for you ,if you say its for a jockey seat i think they do several for manufacturers so they know exactly what you need
I then bought marine ply and cut to base and then used stainless staples over silvertex fabric i bought online ,
Not perfect i know but i had,nt done sewing since junior school so was fairly pleased !
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